Error 506 (duplicate activator code)

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I am trying to add my linux clients to my Retrospect backup server. I have linux clients already added which work fine and have been for quite a long time. One of my clients was added a few months ago and has been running w/o issue until this week when I received the "Error 506 (duplicate activator code)" message when trying to add the client again. I haven't changed/updated anything on the server side. I have run standard OS updates to the linux machine(s) lately.